Exigências de proteína e energia de carneiros Santa Inês na região semiárida brasileira.

Abstract

The objective of this research was to estimate body composition and nutritional requirements of protein and energy for maintenance and gain in weight of Santa Inês sheep in Brazilian semiarid region. The experiment was conducted on the farm Nupeárido, the city of Patos-PB. We used 34 sheep with body weight (BW) averaging 30 kg and mean age of 9 months. For determination of body composition methodology of comparative slaughter of 10 (reference animals) were slaughtered at 30 kg, and the other (24) were divided into eight groups of three animals (one for each treatment: 0, 30 and 60% food restriction). The sheep in each group were slaughtered when the 0% belonged to the treatment of food restriction reached 45 kg LW. The body composition of Santa Ines lambs kept in confinement in semiarid Paraiba, ranged from 198.3 to 187.5 g protein and 105.7 to 146.6 g of fat and 2.2 to 2.6 Mcal/kg of energy when the body weight ranged from 30 to 45 kg. The net requirements of protein for weight gain ranged from 36.54 to 34.54 g/animal/day for animals from 30 to 45 kg body weight respectively, for a gain of 250 g/day. The net protein requirements for maintenance ranged from 6.84 to 9.27 g/animal/day for animals from 30 to 45 kg body weight respectively. The requirements for net energy gain varied from 0.263 to 0.296 Mcal/g animal body weight from 30 to 45 kg respectively. The net energy requirements for maintenance ranged from 0.463 to 0.627 Mcal/animal/day for animals PV 30 to 45 kg respectively.